Convergence Excess occurs where the natural posture of the eyes is closer in than required for near vision tasks.
Convergence excess means the individual, when they look to near vision tasks, has a natural tendency to aim the eyes closer in than the position they are trying to aim at.
For example someone reading would ideally aim and focus the eyes together on the words on the page, in cases of convergence excess there is usually the situation where the eyes meet to aim at a point closer in than the page.
Often individuals can be noted to work closer to the page when this occurs.
This excess of vergence is commonly associated with an Accommodative Insufficiency. The eyes are aimed closer in than desired in an attempt to compensate for reduced focus stamina or focus ability.
This leads to a mismatch between vergence and focus, thus affecting binocular vision accuracy.
Management of convergence excess requires therapeutic spectacle prescription lenses to enhance the focus efficiency thus reducing the need to pull the eyes closer in.
This is a therapeutic treatment that requires monitoring over time to ensure the excessive demand is reduced to within a normal range of focus and convergence.
Usually over time prescriptions can be reduced and wearing time reduced.
Without effective management, myopia (shortsightedness) can often result in later years, such as in high school.